Family name Gueffand-Gad (Gueffand-Gad 
) , all over the world, is an extremely rare cognomen. Much more prevalently, Gueffand-Gad is the forename as well as the last name. Parts of the name also exists independently as a last name Gad.
| VARIANT | COUNTRY |
|---|---|
| Gueffand-Gad | Democratic Republic of the Congo |